Expanding brake and the like



- March 26, 1935. BRUNTON r AL 1,995,534

I EXPANDING BRAKE AND THE LIKE Filed Oct. 23, 1933 INVENTORS L/OHN BRUNTON' Fro/WAS GRAHAM ATTORNEYS Patented Mar. 26, 1935 I r 7 Q UNITED PATENTQQFFICE i 7 ,EXPANDING BRAKE AND John'Brunton, Campbell River, British Columbia, and Thomas Graham, Comox, British Co'- lumbia, Canada r Application October ;2. 3, 1933, Serial No. 694,744

Our invention relates to improvements'in ex; at opposite ends to opposing sides of the brake panding brakes and the like which are particuband to contract it and withdraw it from braking larly adaptedfor use on motor vehicles. engagement with the brake drum 5. 'A plurality.

The objects of the invention are to provide of studs 16 extend from the plate 2 which serve 5 means operable through pull rods, cables or hyas guides for a cone generally indicated by the 5' draulic means whereby the brake band is mainnumeral 17. tained at all times concentric to the drum, so The cone 17 has a peripheral face 18 coincidthat every portion of the brake lining will be ing with the taper of the blocks 14, so that as the subjected to equal wear, thus reducing the efcone is moved towards the plate 2 the blocks 14 fort required to apply the brake and reducing the are forced radially outward, thus expanding the 10 need for adjustment to the minimum. brake band 10. The cone 1'7 isprovided with in- The invention consists of a drum in which an ternal lugs 19 each having a helical thread expanding band is non-rotatably carried and a groove 20 which is engaged by corresponding lugs conical structure is provided within the band 21 extending from a disc 22 which is rotatable which is adapted for endwise movement, said about the outer end of the axle housing 1. The 15 cone being adapted to expand the band into disc 22 is provided with arcuate slots 23 and is braking contact with the drum, as will be more carried. upon shouldered studs 24, which hold fully described in the following specification said disc against movement endwise of the axle, and shown in the accompanying drawing, in Journalled in the plate 2 is a shaft 25 having which:- at one end an operating lever 26 adapted for con- 20 Fig. 1 is a sectional elevation of the brake nection by cable or other means, not shown, to taken from the inside of the drum looking from a brake lever or pedal and fitted at its inner end the wheel side. with a rocking arm 27 which is connected at each Fig. 2 is a sectional view taken on the line 22 d y lin 8 t0 t e di c 2'- of Figure 1. In themodification shown in Figures 3 and 4 25 Fig. 3 is a sectional part elevation of a modifia slightly cheaper construction is provided, the cation. cone 17 is provided with internally projecting Fig. 4 is a sectional view taken on the line 4--4 lugs 29 which slidably engage stops 30 mounted of Figure 3. upon the plate 2. The cone is fitted with a ring 30 In the drawing like characters of reference in- 31 having wedge faced sections 32. The cone is 30 dicate corresponding parts in each figure. moved into engagement by the lugs 21 of the The numeral 1 indicates an axle housing of a' disc 22, such lugs coacting with the wedge faced motor vehicle fitted at its outer end with a plate sections .32. The cone 17 is slidably movable 2. Extending through the housing 1 is an axle 3 upon the studs 16 and is forced outwards by to which the wheel 4 is secured. The wheel 4 is springs 33 upon said studs. .35 fitted with a brake drum 5 having an inner pe- In operation as the lever 26 is drawn in a clockripheral rim 6. wise direction, see Figures 1 and 3, the rocking A plurality of anchor blocks 7 are secured adarm 2'? moves in a similar direction imparting a, jacent the periphery of the plate 2, which blocks turning movement to the disc 22, the lugs 21 of 40 are provided with sides radial to the plate as at 8, which through engagement with the helical 40 see Figure 1, and with an inclined inner face9 thread grooves 20 of the cone force the cone tocoinciding with but spaced from the cone tobe wards the plate 2, the cone face 18 engages the hereinafter described. Loosely carried upon the tapered blocks 14 to spread them apart and explate 2 is a brake band 10 havingthe usual liner pand the brake band 10 into braking engagement 4 material secured to its outer face as at 11, this with the "drum. The reversal of the brake lever hand is preferably divided into two semi-circular through the lugs 21 and the grooves 20 reverses Portions 12 and seculed p the inner 138- the cone movement, thus releasing the braking riphery of the'brake band 10 is a plurality of engagement between the cone 1'? and the brake tapered blocks 14, two of which are disposed in band 10. close proximity to and on' opposite sides of the What we claim as our invention: I 50 anchor blocks '7, so as to prevent rotation of the 1. A brake comprising a plate and a drum, a band and to permit it to expand and contract as contractile brake band non-rotatably carried by required. The tapered surface of theblocks the-plate and adapted for expansion into gripform in effect a conical inner periphery to the ping contact with the drum, said brake band havbrake band. A pair of springs 15 are connected ing a conical interior periphery formed by a plu- 5 rality of closely spaced tapered blocks secured to the interior of the brake band, a cone normally engaging said conical periphery, and means for imparting endwise movement to the cone to expand the brake band.

2. A brake comprising a plate and a drum, a contractile brake ban-d mounted upon the plate, anchor blocks upon the plate adapted to prevent rotational movementto the band, said band having a substantially conical interior periphery formed by a plurality of closely spaced tapered blocks secured to the interior of the brake band; a cone adapted for endwise movement towards o and away from the plate, and screw means for forcing the cone into the conical interior of the brake band to expand it into contact with the drum.

3. A brake comprising a plate and a drum, a contractile band non-rotatably mounted upon the plate a' plurality of closely spaced tapered blocks secured to the inner face of the band, a cone slidable along the axis of the drum into the band to engage the tapered blocks to expand said band, said cone being non-rotatably carried by the plate, a disc rotatable within the cone, and means complementary to said disc and cone for imparting endwise movement to the cone from rotation movement of the disc, and means for rotating the disc.

4. A brake comprising a plate and a drum, a contractile band non-rotatably mounted upon the plate a plurality of closely spaced tapered blocks secured to the inner face of the band, a cone slidable along the axis of the drum into contact with the inner face of the tapered blocks to expand the band, said cone being non-rotatably carried by the plate, a disc rotatable within the cone, means for imparting rotative movement to the cone; and means complementary to the cone and disc whereby rotation of the disc in one direction forces the coneinto the brake band to expand it and whereby rotation of the disc in the opposite direction withdraws the cone and pe mits the bandto contract. o I

r o JOHN BRUNTON.

THOMAS GRAHAM. 

